
Likewise, I cannot find a ring of telepathy, potion of telepathy, wand of telepathy, etc in the DMG. This effect must be different than the ESP spell, as the crystal ball magic item description in the DMG gives 4 versions - crystal ball (plain), with clairaudience, with ESP, or with telepathy.
Well...where in the Nine Hells is telepathy dealt with? It's not detailed as a spell or magic item. I've used it before, I know that. Is this one of those odd things like how for 20 years my mind incorrectly pronounced and spelled the demon's name "Jubilex" when it is actually spelled "Juiblex" even though my eyes read it correctly 500 times?
Does telepathy exist in 2E?
See, dwelling in the bowels of Undermountain this long really does affect one's mind!
